package com.lxkj.dmhw.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;

import java.util.Hashtable;

public class PredicateLayout extends LinearLayout {

	 int mLeft, mRight, mTop, mBottom;
	    Hashtable<View, Position> map = new Hashtable<View, Position>();
	    
	    /**  
	     * 每个view上下的间距  
	     */ 
	    private int dividerLine = 30;
	    /**  
	     * 每个view左右的间距  
	     */ 
	    private int dividerCol = 30;


	    public PredicateLayout(Context context) {
	        super(context);
	    }


	    public PredicateLayout(Context context, int horizontalSpacing, int verticalSpacing) {
	        super(context);
	    }


	    public PredicateLayout(Context context, AttributeSet attrs) {
	        super(context, attrs);
	    }

	public void setDividerLine(int dividerLine) {
		this.dividerLine = dividerLine;
	}

	public void setDividerCol(int dividerCol) {
		this.dividerCol = dividerCol;
	}

	@Override
	    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {


	        int mWidth = MeasureSpec.getSize(widthMeasureSpec);
	        int mCount = getChildCount();
//	        int mX = 0;
//	        int mY = 0;
	        mLeft = 0;
	        mRight = 0;
	        mTop = 5;
	        mBottom = 0;


	        int j = 0;


	        for (int i = 0; i < mCount; i++) {
	            final View child = getChildAt(i);
	           
	            child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
	            // 此处增加onlayout中的换行判断，用于计算所需的高度
	            int childw = child.getMeasuredWidth();
	            int childh = child.getMeasuredHeight();
	            mRight += childw;  //将每次子控件宽度进行统计叠加，如果大于设定的宽度则需要换行，高度即Top坐标也需重新设置


	            Position position = new Position();
	            mLeft = getPosition(i - j, i);
	            mRight = mLeft + child.getMeasuredWidth();
	            if (mRight >= mWidth) {
//	                mX = childw;
//	                mY += childh;
	                j = i;
	                mLeft = getPaddingLeft();
	                mRight = mLeft + child.getMeasuredWidth();
	mTop += childh + dividerLine;
	//PS：如果发现高度还是有问题就得自己再细调了
	            }
	            mBottom = mTop + child.getMeasuredHeight();
//	            mY = mTop;  //每次的高度必须记录 否则控件会叠加到一起 
//	            mX = mRight;
	            position.left = mLeft;
	            position.top = mTop;
	            position.right = mRight;
	            position.bottom = mBottom;
	            map.put(child, position);
	        }
	        setMeasuredDimension(mWidth, mBottom+getPaddingBottom());
	    }


	    @Override
	    protected LayoutParams generateDefaultLayoutParams() {
	        return new LayoutParams(1, 1); // default of 1px spacing
	    }


	    @Override
	    protected void onLayout(boolean changed, int l, int t, int r, int b) {
	        // TODO Auto-generated method stub


	        int count = getChildCount();
	        for (int i = 0; i < count; i++) {
	            View child = getChildAt(i);
	            Position pos = map.get(child);
	            if (pos != null) {
	                child.layout(pos.left, pos.top, pos.right, pos.bottom);
	            } else {
	                Log.i("MyLayout", "error");
	            }
	        }
	    }


	    private class Position {
	        int left, top, right, bottom;
	    }


	    public int getPosition(int IndexInRow, int childIndex) {
	        if (IndexInRow > 0) {
	            return getPosition(IndexInRow - 1, childIndex - 1)
	                    + getChildAt(childIndex - 1).getMeasuredWidth() + dividerCol;
	        }
	        return getPaddingLeft();
	    }
	
}
